2X1A:
reference: Structure of the Rna15 RRM-RNA complex reveals the molecular basis of GU specificity in transcriptional 3'-end processing factors., Pancevac C, Goldstone DC, Ramos A, Taylor IA, Nucleic Acids Res. 2010 Jan 21. PMID: 20097654

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).